Window6 eQUEST Results

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Hello everyone,

I created a window using Window6 and the results appear to be correct
but when I import it into eQUEST the frame does not appear to import.
The total window U-Value in eQUEST is 0.25 which makes sense if it does
not include the frame but the results from Window6 shows a complete
U-Value of 0.434.

Any help is appreciated.

Otto

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Otto Schwieterman's picture
Joined: 2011-09-30
Reputation: 200

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Bruce Easterbrook's picture
Joined: 2011-09-30
Reputation: 0

Thanks Bruce,

I ended up selecting a window in the eQUEST library that was very
similar to the results that I got from Window6.

What are others doing for creating their windows in eQUEST? Are you
selecting the window from the library that is the most similar to the
window that you are using? Are you importing the glass from Window6 or
are you creating the window in eQUEST?

What are you using for the ASHRAE 90.1 baseline window? I typically
select the window from the library that is the closest to the baseline
window values.

Otto Schwieterman's picture
Joined: 2011-09-30
Reputation: 200

Otto -

We have been seeing the same things as Bruce.

When DOE-2 does the import, it is gathering information on the angular (and perhaps spectral) performance of the glazing file, but we have not seen it pulling in any data on the window frame from the overall IGU.

We are currently defining window frames explicitly in eQUEST / DOE-2 (ie u-val, material, dimension, spacer type); I am not (yet!) aware of a way to import the Window6 frame / overall unit U-val into eQUEST.

Aaron Dahlstrom , PE, LEED(r) AP

Dahlstrom, Aaron2's picture
Joined: 2011-09-30
Reputation: 4

Otto -

Re: baseline strategy - what you describe used to be our strategy as well (selecting the window that was closest from the library).

However, on LEED projects, a number of reviewers took issue with that approach, and requested that our models match the u-val and SHGC of the standard exactly.

We often define baseline windows using the simplified method to match the standard.

One of the caveats with the "close as possible" library approach is that ASHRAE hasn't released specific spectral / angular performance curves for the baseline glass ...

Aaron Dahlstrom , PE, LEED(r) AP

Dahlstrom, Aaron2's picture
Joined: 2011-09-30
Reputation: 4

Hi Otto,

I do the same as Aaron - I'll use Window6 to create my window (or glass package rather) and then edit the frame details in eQUEST to match what Window6 gives as the frame U-value

I think that the comment windows and frame are different thermodynamically is true, but I have a caveat: the U-value of the frame and glass are correlated. If you take the same frame and change the glass package then the u-value of the frame will be slightly different in each scenario - it's not a huge difference but it's not 0 either.

The one thing that I've found really strange (or frustrating?) is that the there is a "spacer type" you can select in eQUEST (Window Properties > Basic Specs) that seems to have the same options as the spacers in Window6. The problem is: when you change spacer type in Window6 you can see some pretty noticeable changes in overall window performance, but when you change that field in eQUEST I've gotten 0 change in my model (checking the LV-D for reported frame-inclusive U-value).

Cheers,
Alex

Alex Krickx, LEED AP

John Dossmith's picture
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Joined: 2011-09-30
Reputation: 0

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Bruce Easterbrook's picture
Joined: 2011-09-30
Reputation: 0

If I want to use Window 6 data in my energy model, how do I ensure that the correct frame u-factor is being used? I do not want to use the drop down list provided in the wizards as they reference values from ASHRAE. The frame u-factors are much lower than what's available in ASHRAE document. Is there a place in the software that will allow me to edit my own frame u-factors?

Joseph

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Joined: 2011-06-02
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